EP3185402B1 - Permanentmagnetrotor einer elektrischen maschine - Google Patents

Permanentmagnetrotor einer elektrischen maschine Download PDF

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Publication number
EP3185402B1
EP3185402B1 EP15202604.3A EP15202604A EP3185402B1 EP 3185402 B1 EP3185402 B1 EP 3185402B1 EP 15202604 A EP15202604 A EP 15202604A EP 3185402 B1 EP3185402 B1 EP 3185402B1
Authority
EP
European Patent Office
Prior art keywords
permanent magnets
tangential direction
magnetic flux
permanent magnet
electric machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15202604.3A
Other languages
English (en)
French (fr)
Other versions
EP3185402A1 (de
Inventor
Sunny Zhang
Maurad Berkouk
Thomas Susemihl
Daniel FIEDERLING
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brose Fahrzeugteile SE and Co KG
Original Assignee
Brose Fahrzeugteile SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brose Fahrzeugteile SE and Co KG filed Critical Brose Fahrzeugteile SE and Co KG
Priority to EP15202604.3A priority Critical patent/EP3185402B1/de
Priority to KR1020160176679A priority patent/KR101926850B1/ko
Priority to US15/389,636 priority patent/US11128185B2/en
Priority to CN201611203862.XA priority patent/CN106911239B/zh
Publication of EP3185402A1 publication Critical patent/EP3185402A1/de
Application granted granted Critical
Publication of EP3185402B1 publication Critical patent/EP3185402B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/08—Air inlets for cooling; Shutters or blinds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/12—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of electric gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to an electric machine of a motor vehicle.
  • An electric machine is understood to be a generator, but, in particular, an electric motor.
  • the electric machine is preferably a component of an adjustment drive such as a gearbox actuator or of a radiator fan.
  • the invention also relates to a method for manufacturing an electric machine and to an adjustment drive of a motor vehicle as well as to a rotor of an electric machine.
  • the individual shift stages are set by means of a gearbox actuator.
  • the gearbox actuator has a so-called shift finger and an electric motor, wherein the shift finger can be adjusted by the electric motor.
  • the individual shift stages are selected by means of the shift finger, for which reason the position of the shift finger determines the desired transmission ratio.
  • a brushless electric motor whose stator is energized by means of electronics is usually used as the electric motor.
  • the electronics comprise a number of semiconductor components which are connected in a bridge circuit.
  • the bridge circuit is conventionally a B6 circuit, and the stator has multi-phase windings, in particular three phase field windings which are connected to one another either in a delta connection or star connection.
  • the electric motor furthermore has a permanently excited rotor.
  • a number of permanent magnets which interact with the magnetic field generated by the stator, are mounted on the rotor.
  • the permanent magnets are located in pockets in a rotor body, wherein a laminated core, whose individual laminations are arranged perpendicularly with respect to the axis of the rotor, is usually employed as the rotor body.
  • the laminations bear one against the other via an electrically insulating coating layer, in order to prevent parasitic eddy currents from propagating in the rotor body, whose currents would otherwise limit the efficiency of the electric motor.
  • the permanent magnets In order to be able to apply a comparatively large torque to the electric motor, it is necessary for the permanent magnets to have a comparatively large magnetic flux.
  • permanent magnets are usually employed which have a comparatively high level of magnetic moment. This is usually implemented by permanent magnets which contain rare earth elements that increase manufacturing costs. Owing to the sintering process, the magnetic flux of the permanent magnets is also not constant, for which reason the torque which is applied by means of the electric motor has a ripple.
  • US 2009/0189470 A1 discloses a flux-focused, shaped permanent magnet.
  • the permanent magnet includes a body of magnetic material having multiple surface contouring to form a reduced flux side with convex surfaces and an increased flux side with concave surfaces.
  • US 2013/0320796 A1 discloses a rotor for an interior permanent synchronous machine.
  • a rotor core structure includes an outer cylindrical wall juxtaposed to an air gap.
  • JP H10 271722 A discloses a rotor.
  • the rotor embeds two or more sets of permanent magnets.
  • the invention is based on the object of specifying a particularly suitable electric machine of a motor vehicle, a particularly suitable method for manufacturing an electric machine and a particularly suitable adjustment drive of a motor vehicle, wherein, in particular, a torque ripple Is reduced and/or a torque which can be applied is Increased.
  • the electric machine has a rotor which is mounted so as to be rotatable about a machine axis.
  • the rotor is preferably located inside a stator.
  • the stator suitably comprises at least one electric coil which is energized by means of electronics when the electric machine is used as an electric motor, and the electric motor is embodied, in particular, in a brushless form.
  • the stator preferably comprises three field windings, wherein each of the field windings comprises at least one electric coil.
  • the field windings are placed in electric contact with one another in, for example, a delta connection or star connection.
  • a voltage is tapped at the coil/the field windings.
  • An electric machine is consequently understood to be, in particular, a brushless electric motor (DC motor) or a synchronous machine, but also a generator.
  • the rotor has a number of permanent magnets which are arranged in the radial direction. Consequently, the permanent magnets are distributed essentially in a star shape around the machine axis, and the cross section of each permanent magnet has, perpendicularly with respect to the machine axis, an end (free end) which is located in the region of the machine axis, as well as a further end which is at an enlarged distance from the machine axis.
  • Each of the permanent magnets has one side with a strong magnetic flux and one side with a weak magnetic flux in the tangential direction. The magnetic flux of the side with the strong magnetic flux is larger than the magnetic flux of the side with the weak magnetic flux.
  • the strong magnetic flux and weak magnetic flux relate, in particular, merely to the comparison of the magnetic flux of the two sides, wherein the magnetic flux of the side with the strong magnetic flux is larger than the magnetic flux of the side with the weak magnetic flux.
  • the respective side is determined on the basis of the manufacture of the respective permanent magnet.
  • the side with the weak magnetic flux has a reduced magnetic flux density and/or a reduced magnetic voltage and/or an enlarged magnetic resistance, in particular in comparison with the side with the strong magnetic flux.
  • Permanent magnets are adjacent in the tangential direction, thus different sides are directed towards one another.
  • permanent magnets which are adjacent in the tangential direction point with their respective side with the weak magnetic flux in opposing tangential directions.
  • the side with the strong or weak magnetic flux has respectively adjacent permanent magnets in different tangential directions. Therefore, in each case one side with a strong magnetic flux and in each case one side with a weak magnetic flux of the permanent magnets which are respectively adjacent in the tangential direction are assigned to one another, and vice versa.
  • Adjacent is understood here to mean, in particular, the respective directly adjacent permanent magnet. In other words, there is no further permanent magnet between two adjacent permanent magnets.
  • the electric machine preferably has an even number of permanent magnets.
  • the electric machine has between 6 and 20, 8 and 14 and preferably 10 such permanent magnets.
  • the angle which is formed between adjacent permanent magnets and whose apex is located on the machine axis, is expediently always of the same size and preferably equal to 360° divided by the number of permanent magnets.
  • the rotor suitably has merely permanent magnets with one side with a strong magnetic flux in the tangential direction, and with one side with a weak magnetic flux in the tangential direction wherein all the permanent magnets are arranged in such a way that when permanent magnets are adjacent in the tangential direction, different sides are directed towards one another.
  • the side with the strong magnetic flux compensates the reduced magnetic flux of the side of the weak magnetic flux of the respective adjacent permanent magnet, and vice versa, for which reason an essentially constant magnetic flux is present between respectively adjacent permanent magnets.
  • the magnetic field of the rotor is essentially rotationally symmetrical with respect to the machine axis, for which reason a torque ripple when the rotor rotates about the machine axis is reduced.
  • the electric machine is a component of a motor vehicle and, in particular, of a secondary assembly of the motor vehicle. In other words, the electric machine does not serve to drive the motor vehicle itself.
  • the electric machine is a component of a radiator fan, of a window lifter or of an electric seat adjustment device.
  • the electric machine is particularly preferably used as a component of a power steering system, as what is referred to as a steering motor, or as a component of a gearbox actuator by means of which shift stages of a gearbox are selected in an automated fashion during operation.
  • Each of the permanent magnets is preferably in one piece, which, on the one hand, reduces manufacturing costs of the permanent magnets. On the other hand, mounting on further components of the rotor is simplified.
  • each of the permanent magnets is sintered, that is to say in particular produced from a powdery material.
  • the ferrite powder is preferably used, which is particularly preferably free of rare earth elements. Consequently each of the permanent magnets further reduces manufacturing costs.
  • Each of the permanent magnets is magnetized in the tangential direction.
  • a magnetic pole that is to say a north pole or a south pole, which points in the radial direction and which interacts during operation with the magnetic field produced by means of the stator, if one is present, is located in the tangential direction between respectively adjacent permanent magnets.
  • each of the north poles and each of the south poles is respectively assigned to one side with a strong magnetic flux and one side with a weak magnetic flux, for which reason the strength of each magnetic pole is essentially the same with the result that a torque ripple is reduced.
  • the cross section of the permanent magnets is rectangular perpendicularly with respect to the machine axis, wherein two of the edges of each cross section are arranged in parallel and axially symmetrical in relation to a respective radial straight line.
  • the permanent magnets are distributed in a star shape around the machine axis.
  • each permanent magnet has a C-shaped cross section which is formed perpendicularly with respect to the machine axis.
  • the cross section therefore has a convex boundary line or the concave boundary line.
  • the two free ends of each of the cross sections is located here on a radial straight line, that is to say on a straight line which intersects the machine axis.
  • Each permanent magnet itself is at least partially spaced apart from this radial straight line or at least curved away therefrom owing to the C-shaped cross section, wherein the concave boundary curve is at a smaller distance from the radial straight line, in particular in the region of the curvature.
  • each of the permanent magnets Owing to the C-shaped cross section, each of the permanent magnets has an increased volume in comparison with a rectangular cross section, for which reason, even when comparatively cost-effective materials, which have, for example, a reduced level of magnetic moment, are used, the rotor has a comparatively large magnetic flux, which increases the efficiency of the electric machine.
  • All the permanent magnets are curved in the same tangential direction.
  • the two free ends of each of the permanent magnets point In the same tangential direction, and the curvature which is made available by means of the C-shaped cross section is always located on the same side of the respective radial straight line in the tangential direction. Consequently, the arrangement of the cross sections of all the permanent magnets is essentially turbine-like.
  • the permanent magnets are preferably arranged in a rotationally symmetrical fashion with respect to the machine axis.
  • the rotational angle is preferably equal to the angle between two adjacent permanent magnets, wherein the apex is located on the machine axis.
  • the arrangement with respect to the magnetic flux is expediently not taken into account in this consideration of symmetry.
  • the positioning of all the permanent magnets with respect to the magnetic flux is interchanged in a rotationally symmetrical mapping with respect to only the single multiple of the angle formed between two adjacent permanent magnets.
  • one side with a strong magnetic flux is mapped onto one side with a weak magnetic flux, and vice versa.
  • each of the permanent magnets Is, for example, formed essentially by means of three rectangles which are offset at a specific angle with respect to one another, wherein one of the rectangles is connected on a free side with, in each case, one of the two further rectangles.
  • at least one of the boundary curves is formed by means of an arc, for example the convex boundary line or the concave boundary line.
  • the cross section particularly preferably has a convex boundary curve and a concave boundary curve, which are both respective arcs or segments of a circle.
  • the centre point of the two arcs is preferably located on an auxiliary straight line which is perpendicular with respect to the radial straight line on which the two free ends of the C-shaped cross section are located.
  • the auxiliary straight line is suitably arranged centrally between the two free ends in a radial direction.
  • the radius of the arc which forms the concave boundary curve is equal to the radius of the arc which forms the convex boundary curve.
  • the centre points of the two arcs are shifted with respect to one another, wherein they are located, in particular, on the auxiliary straight line.
  • the arc which forms the concave boundary curve has a larger radius than the arc which forms the convex boundary curve.
  • the two boundary curves intersect at the two free ends or merge with a blunt, rounded tip.
  • each permanent magnet is bounded in the radial direction with a tangential or curved boundary edge.
  • the concave boundary curve is formed with an arc whose radius extends towards infinity.
  • the cross section of the permanent magnet is essentially D-shaped.
  • the radius is preferably finite and preferably smaller than the extent of the permanent magnet in the radial direction.
  • the radius of the arc which forms the concave boundary curve is particularly preferably also smaller than the extent of the permanent magnet in the radial direction.
  • the radius of the arc which forms the concave boundary curve is suitably larger than the radius of the arc which forms the convex boundary curve, and the centre point of the arc which forms the convex boundary curve is offset from the centre point of the arc which forms the concave boundary curve, in the direction of the concave boundary curve. Owing to the enlarged convex boundary curve, the magnetic flux density of each permanent magnet, and consequently also the torque of the electric machine, are increased.
  • the rotor preferably comprises a laminated core which is formed from individual laminations stacked one on top of the other in the axial direction.
  • the axial direction is parallel to the machine axis.
  • the individual laminations are connected, for example, by means of bonding or punch-packing to form the laminated core.
  • the laminations are produced from a soft iron and provided with an electrical insulation layer, which prevents the formation of eddy currents.
  • the rotor comprises a shaft to which the laminated core is connected, wherein the shaft is parallel to the axial direction and concentric with respect to the machine axis.
  • the laminated core has a number of recesses which is equal to the number of permanent magnets. In each case, one of the permanent magnets is arranged inside each of the recesses. In particular, at least partially a positively locking engagement and/or frictionally locking engagement is formed between the laminated core and the permanent magnets.
  • each recess is open on the outside in the radial direction to form a slot which runs in the axial direction.
  • each of the recesses is preferably bounded in the radial direction by means of a projection, by means of which the tangential orientation of the slot is reduced.
  • each recess has the projection which is directed in the tangential direction and against which the respective permanent magnet bears. This essentially excludes the possibility of the permanent magnet becoming detached from the laminated core.
  • compensation of tolerances is made possible.
  • concentrating the magnetic flux which is produced by means of the respective permanent magnet is ensured by the individual projections.
  • Each of the recesses preferably has two such projections which are, in particular, directed towards one another.
  • the two projections secure the permanent magnet in the radial direction and the recess consequently engages around the permanent magnet essentially in an L-shape. Consequently, the two projections form a means of rear engagement for the permanent magnet, for which reason detachment from the laminated core is prevented.
  • each of the permanent magnets bears against the respectively assigned projection, at least in a partially frictionally locking and/or positively locking fashion.
  • the laminated core comprises a number of holders which corresponds, in particular, to the number of permanent magnets.
  • the holders are arranged in the tangential direction between the individual permanent magnets, for which reason adjacent permanent magnets are spaced apart from one another in the tangential direction by means of the holders.
  • the permanent magnets bear against the respective holders in an at least partially frictionally locking and/or positively locking fashion.
  • the holders themselves are connected to a securing star whose centre point is located on the machine axis.
  • One of the holders is connected, in particular integrally moulded on, to each of the tips of the central securing star.
  • An opening is preferably present between adjacent tips of the securing star, which essentially excludes the possibility of the formation of magnetic fields which are directed away from the stator.
  • the laminated core preferably has a number of axial recesses which are arranged in the tangential direction between adjacent permanent magnets.
  • each of the holders has one of the axial recesses if these are present.
  • the axial recesses have, for example, a round, oval or triangular cross section.
  • the cross section is an equilateral triangle.
  • one tip of the triangle points towards the machine axis, and the triangle is preferably arranged axis-symmetrically with respect to a radial straight line.
  • the axial recesses make it possible for the magnetic fields which are produced by means of the permanent magnets to be directed away from the machine axis, in particular towards the stator, which improves the efficiency of the electric machine.
  • the method for manufacturing an electric machine which has a rotor which is mounted so as to be rotatable about a machine axis and has a number of permanent magnets which are arranged in the radial direction, wherein each permanent magnet has one side with a strong magnetic flux and one side with a weak magnetic flux in the tangential direction, wherein when permanent magnets are adjacent in the tangential direction, different sides are directed towards one another, provides that in a first working step a first permanent magnet is determined which has one side with a strong magnetic flux and one side with a weak magnetic flux in the tangential direction. In a further working step, which can take place simultaneously or chronologically independently thereon, a second permanent magnet is determined which has one side with a strong magnetic flux and one side with a weak magnetic flux in the tangential direction.
  • the two permanent magnets are arranged adjacent to one another in the tangential direction in such a way that different sides are directed towards one another.
  • either the side with the strong magnetic flux of the first permanent magnet is directed towards the side with the weak magnetic flux of a second permanent magnet, or the side with the weak magnetic flux in the first permanent magnet is directed towards the side of the strong magnetic flux of the second permanent magnet.
  • the respective side with the strong magnetic flux and that with the weak magnetic flux are determined and all the magnets are arranged in such a way that when permanent magnets are adjacent in the tangential direction, different sides are directed towards one another.
  • the invention relates to an electric machine which is manufactured according to this method.
  • the electric machine is preferably produced in a process in which the method is carried out repeatedly, in particular between 2 and 10 times, wherein all of the electric machines which are produced by means of the process have the same arrangement as the permanent magnets with respect to the sides with the strong and weak magnetic flux, respectively.
  • the rotor of the electric machine has a number of permanent magnets which are arranged in the radial direction.
  • the permanent magnets have one side with a strong magnetic flux and one side with a weak magnetic flux in the tangential direction, and are arranged in such a way that when permanent magnets are adjacent in the tangential direction, different sides are directed towards one another.
  • each of the permanent magnets has a C-shaped cross section perpendicularly with respect to the machine axis, wherein the cross section has a concave boundary curve and a convex boundary curve which are both arcs whose centre point is in each case located on an auxiliary straight line which is perpendicular with respect to a radial straight line on which the free ends of the respective cross section are arranged, wherein the arc which forms the concave boundary curve has a larger radius than the arc which forms the convex boundary curve.
  • the adjustment drive of a motor vehicle has an electric machine with such a rotor.
  • the adjustment drive is an electric window lifter, an electric sunroof or an electric seat adjustment device.
  • the adjustment drive is a radiator fan.
  • the adjustment drive particularly preferably has a gearbox actuator by means of which an automatic or semi-automatic gearbox of the motor vehicle is actuated.
  • the gearbox actuator either activates a clutch and/or drives a shaft finger by means of which a shift stage of the gearbox is selected. Exemplary embodiments of the invention are explained in more detail below with reference to a drawing, in which:
  • Fig. 1 is a schematic illustration of a drive train 2 of a motor vehicle.
  • An internal combustion engine 4 is operatively connected to driven wheels 12 via a first shaft 6, a gearbox 8, a second shaft 10 and a differential (not shown).
  • the rotational movement of the first shaft 6, driven directly by the internal combustion engine 4 is converted into a rotational movement of the driven wheels 12, wherein both the direction of rotation and the rotational speeds of the two differ.
  • the rotational movement occurs essentially at a right angle to the rotational movement of the second shaft 10.
  • a specific transmission ratio between the first shaft 6 and the second shaft 10 is determined by means of the gearbox 8.
  • the direction of rotation of the second shaft 10 is set by means of the gearbox 8.
  • the gearbox 8 has a number of what are referred to as shift stages which are selected by means of a gearbox actuator 16 which comprises an electric motor 14.
  • the electric motor 14 drives, for this purpose, an adjustment part of the gearbox actuator 16, which is in turn operatively connected to a selection mechanism of the gearbox 8.
  • the gearbox actuator 16 also has controller electronics (not shown) which control the electric motor 14 and which are set by a selector lever 20 via a data line 18.
  • the data line 18 is a CAN bus, and the driver can select the direction of movement of the motor vehicle by means of the selector lever 20.
  • FIG. 2 illustrates the electric motor 14 , not forming part of the invention, perpendicularly with respect to a machine axis 22 in a sectional illustration.
  • the electric motor 14 has a rotor 24 which is mounted so as to be rotatable about the machine axis 22 and comprises a machine shaft 26 centrally.
  • the adjustment part of the gearbox actuator 16 is connected to the machine shaft 26, and the machine shaft 26 is mounted so as to be rotatable by means of bearings, for example ball bearings (not illustrated in more detail).
  • a laminated core 28 is connected in a rotationally fixed fashion to the machine shaft 26 and has a number of individual laminations which are stacked one on top of the other in the axial direction A, that is to say parallel to the machine axis 22.
  • the laminated core 28 has 10 recesses 30 which run in a rotationally symmetric fashion with respect to the machine axis 22 and radially and which are opened radially on the outside by means of a slot 32 in each case.
  • Each of the slots 32 is bounded by means of two projections 34, directed towards one another, of the laminated core 28.
  • An essentially cuboid-shaped permanent magnet 36 is arranged inside each of the recesses 30, said permanent magnets 36 therefore also being arranged in the radial direction R and surrounding the machine axis 22 essentially in a star shape.
  • the permanent magnets 36 are produced in one piece from a ferrite powder by means of sintering. Owing to this method of manufacture, each of the permanent magnets 36 has one side with a strong magnetic flux 38 and one side with a weak magnetic flux 40. These two sides 38, 40 bound the respective permanent magnet 36 in the tangential direction T.
  • permanent magnets 36 are respectively adjacent in the tangential direction T, in each case different sides 38, 40 are directed towards one another. Consequently, all the sides with a strong magnetic flux 38 point in a single tangential direction T. In the variant illustrated, all the sides with the strong magnetic flux 38 point in the anticlockwise direction, while all the sides with a weak magnetic flux 40 point in the clockwise direction, in relation to the respective permanent magnet 36 in each case.
  • Each of the permanent magnets 36 has a magnetization direction 42 which is directed in the tangential direction T with respect to each of the permanent magnets 36.
  • permanent magnets 36 which are respectively adjacent in the tangential direction T are magnetized in opposing directions, with the result that in each case the two north poles or the two south poles are directed towards one another.
  • a radially outwardly directed magnetic pole is formed between permanent magnets 36 which are respectively adjacent in the tangential direction T.
  • each of the magnet poles is assigned both one side of a strong magnetic flux 38 and one side of a weak magnetic flux 40, for which reason the magnetic flux of each of the magnetic poles is essentially of equal magnitude. This results in reduced torque ripple during the operation of the electric motor 14.
  • the laminated core 28 has in each case an axial recess 44 between respectively adjacent recesses 30, said axial recess 44 having, for example, a round cross section (illustrated here).
  • the magnetic field which is produced by means of the permanent magnets 36 is suitably shaped by means of the axial recess 44 which runs parallel to the machine axis 22.
  • the rotor 24 is surrounded in the radial direction R by a stator 46 to form an air gap 48.
  • the stator 46 has a number of teeth 50, in this case 12 teeth 50, which run in the axial direction A, that is to say parallel to the machine axis 22.
  • Each of the teeth 50 is wound with an electric coil 52, by means of which a magnetic field which rotates about the machine axis 22 is made available during operation. Said magnetic field interacts with the magnetic field made available by means of the permanent magnets 36, which moves the rotor 24 in a rotational movement about the machine axis 22.
  • Figure 3 illustrates an embodiment of the electric motor 14, wherein the stator 46 with its teeth 50 and electric coils 52 has been left unchanged.
  • the rotor 24 is modified, and has, in turn, the machine shaft 26 and the laminated core 28, which is, however, modified.
  • the axial recesses 44 are offset inwards in the radial direction R and have an essentially oval cross section.
  • the recesses 30 and the permanent magnets 36 are changed and are in turn positioned inside the recesses 30.
  • each of the recesses 30 is again assigned in each case to one of the permanent magnets 36.
  • the recesses 30 also each have, on the outside in the radial direction R, the slot 32 which is bounded by means of the two projections 34, said slots 32 being directed towards one another.
  • the magnetization direction 42 of each of the permanent magnets 36 also runs in the tangential direction T, wherein in each case identical magnetic poles are directed towards one another when permanent magnets 36 are adjacent in the tangential direction T.
  • each of the permanent magnets 36 has an essentially C-shaped cross section perpendicularly with respect to the machine axis 22. Consequently, each of the permanent magnets 36 has a convex boundary curve 54 and a concave boundary curve 56 which run between the two free ends 58 of the permanent magnet 36.
  • the two free ends 58 of each of the permanent magnets 36 are located in each case on an assigned radial straight line 60.
  • the convex boundary curves 54 bound the respective permanent magnet 36 in the same tangential direction T in each case, and also the concave boundary curves 54. All of the concave boundary curves 56 in the illustrated example point in the clockwise direction, while the convex boundary curves 54 point counter to the clockwise direction.
  • the permanent magnets 36 are distributed around the machine axis 22 essentially in a turbine-like fashion and are curved in the same tangential direction T.
  • the side with the strong magnetic flux 38 is located on the convex boundary curve 54, while the concave boundary curve 56 is formed by means of the side with the weak magnetic flux 40.
  • Figure 4a illustrates a further embodiment of the rotor 24 according to figure 3 .
  • the permanent magnets 36 and the shaft 26 are essentially left unchanged.
  • the side with the strong magnetic flux 38 and that with the weak magnetic flux 40 are interchanged.
  • the convex boundary curve 54 is formed by means of the side with the weak magnetic flux 40
  • the concave boundary curve 56 is formed by means of the side with the strong magnetic flux 38.
  • the magnetization direction 42 is left the same, as is the radial arrangement of the permanent magnets 36, whose free ends 58 are each located on a radial straight line 60 and have an essentially C-shaped cross section.
  • the laminated core 28 is modified, wherein the axial recesses 44 have an essentially round cross section and are offset further towards the outside in the radial direction R compared to the previous embodiment.
  • the laminated core 28 has a central securing star 62 which surrounds the shaft 26.
  • the central securing star 62 has 10 tips 64 and is configured rotationally symmetrical with respect to the machine axis 22.
  • the holder 66 is integrally formed onto each of the tips 64, wherein each of the tips 64 is respectively assigned to one of the holders 66.
  • the holders 66 are arranged between respectively adjacent permanent magnets 36 in the tangential direction T, with the result that the recesses 30 are formed by means of the holders 66. In this context, the holders 66 also have the projections 34.
  • the concave boundary curve 56 and the convex boundary curve 54 of the permanent magnets 36 do not bear over their full surface on the laminated core 28 in the form of the holders 66.
  • the recesses 30 have groove-shaped depressions 68, wherein, for example, three different types of depressions 68 are formed here.
  • Three adjacent recesses 30 and the recesses 30 which are arranged in a point-symmetrical fashion with respect to the machine axis 22 each have four groove-shaped depressions 68, wherein in each case two are assigned to the holder 66 of the respective recess 30.
  • two depressions 68 which lie opposite in the tangential direction T are replaced by two depressions 68 which, however, have a smaller radial extent.
  • the radially inner depressions 68 and, on the other hand, the two outer depressions 68 are replaced by means of the two depressions 68.
  • the concave boundary curve 56 is not completely surrounded by the laminated core. Instead, a recess 70 is formed between the holder 66 and the permanent magnet, said recess 70 being enclosed by the projection 34 which is arranged on the side.
  • Figure 4B illustrates this recess 70 once more in more detail and shows a portion of said further embodiment of the rotor 24.
  • the triangle is equilateral, and the tip points radially inwards towards the machine axis 22.
  • Figure 5 is a perspective view of one of the permanent magnets 36, which is produced from the sintered ferrite powder.
  • the cross section perpendicularly with respect to the axial direction A is C-shaped, wherein the convex boundary curve 54 and the concave boundary curve 56 are located between the two free ends 58.
  • One of these two curves is formed by means of the side with the weak magnetic flux 40, and the remaining curve is formed by means of the side with the strong magnetic flux 38.
  • the convex boundary curve 54 is made available by means of the side with the weak magnetic flux 40.
  • the magnetic field which is made available by means of the permanent magnet 36 is enlarged, since said magnetic field is essentially dependent on the surface of the permanent magnet 36 and is essentially proportional with respect thereto. Since their convex boundary surface 54 is formed by means of an arc between the two free ends 58, the magnetic field which is made available by means of the permanent magnet 36 is enlarged in comparison with the variant illustrated in figure 2 in which the two free ends 58 of each permanent magnet 36 are connected by means of a straight curve.
  • FIG. 6 illustrates a further embodiment of the permanent magnet 36, wherein each of the free ends 58 is formed by means of an acute angle, and not by means of a stepped surface as in the preceding example.
  • the two free ends 58 are located on the radial straight line 60 which is intersected perpendicularly by an auxiliary straight line 72, in the central position between the two free ends 58.
  • a centre point 74 of an arc by means of which the concave boundary curve 56 is formed, and a centre point 76 of an arc by means of which the convex boundary curve 54 is formed, are located on the auxiliary straight line 72.
  • all the points of the convex boundary curve 54 have the same distance from the centre point 76, specifically a first radius 78.
  • the points of the concave boundary curve 56 have the same distance from the centre point 74, specifically a secondary radius 80.
  • the two radii 78, 80 are each for example of equal magnitude or, as in the variant illustrated here, the second radius 80 is larger than the first radius 78.
  • the arc which forms the concave boundary curve 56 has the larger second radius 80
  • the arc which forms the convex boundary curve 54 has the smaller first radius 78.
  • the two boundary curves 54, 56 are also preferably made available by means of an arc.
  • Figures 7A and 7B illustrates the cross section through the permanent magnet 36 once more.
  • the magnetization direction 42 is shown.
  • this magnetization direction 42 is directed in the tangential direction T.
  • said magnetization direction 42 is directed perpendicularly either with respect to the concave boundary curve 56 or with respect to the convex boundary curve 54, that is to say consequently essentially towards the respectively assigned centre point 74, 76.
  • Figure 8A shows once more the permanent magnet 36 which is illustrated in figure 7A and which is modified in figures 8B, 8C .
  • the convex boundary curve 54 which is formed by means of an arc in figure 8A , is replaced at least partially by a trapezoidal shape.
  • the free ends 58 are configured in a thickened fashion.
  • the concave boundary curve 56 is also configured in an essentially trapezoidal shape.
  • the arc is replaced by means of a curve which is formed by means of three sections.
  • the magnetization direction 42 is not illustrated and is either in the tangential direction T or perpendicular in relation to the respective boundary face 54, 56.
  • Figure 9 illustrates a method 82 for manufacturing the electric motor 14.
  • a first working step 84 one of the permanent magnets 36, which has the side with the strong magnetic flux 38 and the side with the weak magnetic flux 40 in the tangential direction T, is determined.
  • a further of the permanent magnets 36 is determined which also has the side with the strong magnetic flux 38 and the side with the weak magnetic flux 40 in the tangential direction T.
  • the two permanent magnets 36 are arranged inside the laminated core 28 in such a way that the side with the weak magnetic flux 40 of one of the two permanent magnets 36 points towards the side with the strong magnetic flux 38 of the remaining permanent magnet 36.
  • these two sides 38, 40 bear against the same holder 66 and surround it, if the electric motor 40 (illustrated in figure 3 ) is produced.
  • Fig. 10 shows an exemplary electric motor in an adjustment drive in the form of a radiator fan 90 of the motor vehicle in a schematic sectional illustration in a relative wind direction 92.
  • the relative wind direction 92 is directed parallel to a travel direction of the motor vehicle 2 and counter thereto.
  • the relative wind direction 92 denotes, in particular, the direction of a relative wind which impinges on the motor vehicle 2 during its satisfactory operation.
  • the motor vehicle 2 comprises a radiator crossrail 94 with a radiator block 96, on which a fan shroud 98 is mounted.
  • the attachment is carried out by means of separate webs 100.
  • the illustrated fan shroud 98 is not connected to the radiator block 96 in an airtight fashion.
  • airtight mounting of the radiator crossrail 94 on the radiator block 96 would be conceivable.
  • An impeller wheel 104 of the radiator fan 90 is arranged in a recess 102 in the fan shroud 98 and is essentially parallel to the radiator block 96.
  • the junction between the impeller wheel 104 and the fan shroud 98 can be implemented by means of specific contours or brushes (not shown here) in order to avoid what is referred to as leakage air.
  • the impeller wheel 104 is driven by means of the machine shaft 26 of the electric motor 14.
  • the electric motor 14, which is a component of the radiator fan 90, is in turn attached to the fan shroud 98 by means of struts 106 and is positioned between the impeller wheel 104 and the radiator block 96.
  • the rotor 24 of the electric motor 14 corresponds to one of the embodiments shown above.
  • a number of fan blades 108 are operatively connected to the shaft 18, with their radial extent being small compared to the impeller wheel 104 and being equal to the radial extent of a housing 110 of the electric motor 14.
  • the housing 110 is essentially cylindrical, wherein the cylinder axis is parallel to the relative wind direction 92.
  • a number of inlet openings 112 and outlet openings 114 are formed in the housing 110, in each case in the base face or cover face of the cylinder-like housing 110 within which the rotor 24 and the stator 46 of the electric motor 14 are arranged.
  • a relative wind 116 is amplified, or generated when the motor vehicle 2 is stationary, said relative wind 116 being parallel to the relative wind direction 2 and being directed in the same direction as the latter.
  • the relative wind 116 is therefore sucked through the radiator block 96 by means of the radiator fan 90.
  • the relative wind 116 impinges at least partially on one of the cover faces of the cylinder-like housing 110. This portion enters the housing 110 via the inlet openings 112 and is sucked again out of the housing 110 through the outlet openings 114 by means of the fan blades 108 which have the same direction of rotation as the impeller wheel 104.
  • the air flow within the housing 110 therefore runs essentially parallel to the relative wind direction 2 and to the relative wind 116 which is directed around the housing 110.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Claims (8)

  1. Elektrische Maschine (14) eines Kraftfahrzeugs, insbesondere eines Verstellantriebs (16) oder eines Kühlerlüfters (90), mit einem mindestens eine elektrische Spule umfassenden Stator (46) und mit einem um eine Maschinenachse (22) drehbar gelagerten Rotor (24), der eine Anzahl von in radialer Richtung (R) angeordneten Permanentmagneten (36) aufweist, wobei jeder Permanentmagnet (36) eine Seite mit starkem Magnetfluss (38) und eine Seite mit schwachem Magnetfluss (40) in tangentialer Richtung (T) aufweist, wobei bei in tangentialer Richtung (T) benachbarten Permanentmagneten (36) verschiedene Seiten (38, 40) aufeinander zu gerichtet sind, wobei die Permanentmagnete (36) in der tangentialen Richtung (T) magnetisiert sind, wobei Permanentmagnete (36), die jeweils in der tangentialen Richtung (T) benachbart sind, in entgegengesetzten Richtungen magnetisiert sind, wobei jeder Permanentmagnet (36) senkrecht zur Maschinenachse (22) jeweils einen C-förmigen Querschnitt aufweist, wobei jedes freie Ende (58) auf einer radialen Geraden (60) liegt, und wobei alle Permanentmagnete (36) in der gleichen tangentialen Richtung (T) gekrümmt sind.
  2. Elektrische Maschine (14) nach Anspruch 1,
    dadurch gekennzeichnet,
    dass jeder Permanentmagnet (36) aus einem Stück und/oder gesintert ist, insbesondere aus einem Ferritpulver.
  3. Elektrische Maschine (14) nach Anspruch 1 oder 2,
    dadurch gekennzeichnet,
    dass der Querschnitt eine konkave Begrenzungskurve (56) und eine konvexe Begrenzungskurve (54) aufweist, welche beide Bögen sind, deren Mittelpunkte (76, 74) jeweils auf einer Hilfsgeraden (72) liegen, die senkrecht zur radialen Geraden (60) angeordnet ist, wobei die Hilfsgerade (72) in radialer Richtung (R), insbesondere mittig zwischen den beiden freien Enden (58) angeordnet ist.
  4. Elektrische Maschine (14) nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet,
    dass der Bogen, der die konkave Begrenzungskurve (56) bildet, einen größeren Radius (80) aufweist als der Bogen, der die konvexe Begrenzungskurve (54) bildet.
  5. Elektrische Maschine (14) nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet,
    dass der Rotor (24) ein Blechpaket (28) mit einer der Anzahl von Permanentmagneten (36) entsprechenden Anzahl von Ausnehmungen (30) aufweist, wobei jeweils einer der Permanentmagnete (36) innerhalb einer der Ausnehmungen angeordnet ist.
  6. Elektrische Maschine (14) nach Anspruch 5,
    dadurch gekennzeichnet,
    dass jede Ausnehmung (30) jeweils in radialer Richtung (R) außen durch einen Vorsprung (34), insbesondere durch zwei aufeinander zu gerichtete Vorsprünge (34), begrenzt ist und/oder dass das Blechpaket (28) Halterungen (66) aufweist, die in tangentialer Richtung (T) zwischen den Permanentmagneten (36) angeordnet sind und jeweils mit einer Spitze (64) eines zentralen Befestigungssterns (62) verbunden sind, und/oder dass in tangentialer Richtung (T) zwischen jeweils benachbarten Permanentmagneten (36) eine axiale Ausnehmung (44) angeordnet ist.
  7. Verfahren (82) zur Herstellung einer elektrischen Maschine (14) eines Kraftfahrzeugs, insbesondere eines Verstellantriebs (16) oder eines Kühlerlüfters (90), mit einem mindestens eine elektrische Spule umfassenden Stator (46) und mit einem um eine Maschinenachse (22) drehbar gelagerten Rotor (24), der eine Anzahl von in radialer Richtung (R) angeordneten Permanentmagneten (36) aufweist, wobei jeder Permanentmagnet (36) eine Seite mit starkem Magnetfluss (38) und eine Seite mit schwachem Magnetfluss (40) in tangentialer Richtung (T) aufweist, wobei bei in tangentialer Richtung (T) benachbarten Permanentmagneten (36) unterschiedliche Seiten (38, 40) aufeinander zu gerichtet sind, wobei die Permanentmagnete (36) in tangentialer Richtung (T) magnetisiert sind, wobei in tangentialer Richtung (T) jeweils benachbarte Permanentmagnete (36) in entgegengesetzten Richtungen magnetisiert sind, wobei jeder Permanentmagnet (36) senkrecht zur Maschinenachse (22) jeweils einen C-förmigen Querschnitt aufweist, wobei jedes freie Ende (58) auf einer radialen Geraden (60) liegt, und wobei alle Permanentmagnete (36) in der gleichen tangentialen Richtung (T) gekrümmt sind, in der ein erster Permanentmagnet (36), der in der tangentialen Richtung (T) eine Seite mit starkem Magnetfluss (38) und eine Seite mit schwachem Magnetfluss (40) aufweist, und einen zweiten Permanentmagneten (36), der eine Seite mit einem starken magnetischen Fluss (38) und eine Seite mit einem schwachen magnetischen Fluss (40) in tangentialer Richtung (T) aufweist, bestimmt werden, und in der die beiden Permanentmagnete (36) so benachbart zueinander angeordnet sind, dass unterschiedliche Seiten (38, 40) aufeinander zu gerichtet sind.
  8. Verstellantrieb (16, 90) eines Kraftfahrzeugs, insbesondere Getriebeaktuator oder Kühlerlüfter, mit einer elektrischen Maschine (14) mit einem mindestens eine elektrische Spule umfassenden Stator (46) und mit einem um eine Maschinenachse (22) drehbar gelagerten Rotor (24), der eine Anzahl von in radialer Richtung (R) angeordneten Permanentmagneten (36) aufweist, wobei jeder Permanentmagnet (36) eine Seite mit einem starken Magnetfluss (38) und eine Seite mit einem schwachen Magnetfluss (40) in tangentialer Richtung (T) aufweist, wobei bei in tangentialer Richtung (T) benachbarten Permanentmagneten (36) unterschiedliche Seiten (38, 40) aufeinander zu gerichtet sind, wobei die Permanentmagnete (36) in der tangentialen Richtung (T) magnetisiert sind, wobei Permanentmagnete (36), die jeweils in der tangentialen Richtung (T) benachbart sind, in entgegengesetzten Richtungen magnetisiert sind, wobei jeder Permanentmagnet (36) senkrecht zur Maschinenachse (22) jeweils einen C-förmigen Querschnitt aufweist, wobei jedes freie Ende (58) auf einer radialen Geraden (60) liegt, und wobei alle Permanentmagnete (36) in der gleichen tangentialen Richtung (T) gekrümmt sind.
EP15202604.3A 2015-12-23 2015-12-23 Permanentmagnetrotor einer elektrischen maschine Active EP3185402B1 (de)

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EP15202604.3A EP3185402B1 (de) 2015-12-23 2015-12-23 Permanentmagnetrotor einer elektrischen maschine
KR1020160176679A KR101926850B1 (ko) 2015-12-23 2016-12-22 전기 기계
US15/389,636 US11128185B2 (en) 2015-12-23 2016-12-23 Electric machine, method of manufacturing the electric machine, rotor and adjustment device
CN201611203862.XA CN106911239B (zh) 2015-12-23 2016-12-23 电机

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CN106911239A (zh) 2017-06-30
KR20170075660A (ko) 2017-07-03
CN106911239B (zh) 2020-04-28
US20170187256A1 (en) 2017-06-29
US11128185B2 (en) 2021-09-21
EP3185402A1 (de) 2017-06-28
KR101926850B1 (ko) 2018-12-07

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